This American made diesel engine, the Caterpillar C12 is best used in trucks with a range of uses from on-highway buses and trucks to industrial vehicles. The Cat C12 offers an environmentally friendly engine by taking full advantage of the electronically controlled unit injection fuel system, resulting in outstanding fuel economy and performance. Optional display systems available and an electronic control system with additional room for future enhancements. This engine features a fan-drive mounting bracket, front engine supports, a lubricating oil filter and a dry charge coolant conditioner. Minimum recommended engine speed at cruising is 1,400 rpm at 55 mph with a maximum cruising speed at 1,700 rpm.